<?php function add_rss_links() { ?>
  <link rel="alternate" type="application/rss+xml" title="Revisions" href="<?php echo getURL('revisions/all?format=rss') ?>" />
  <link rel="alternate" type="application/rss+xml" title="Comments" href="<?php echo getURL('comments/all?format=rss') ?>" />
<?php } ?>
<?php add_hook('html_head','add_rss_links()') ?>